The single crystal electronic spectra of cis-octahedral nickel(II) diamine complexes at 10 K

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Abstract
The single crystal polarised spectra, at 10 K, of a series of nickel(II) complexes containing the cis-chromophore NiN4O2 are reported. The four N ligands are provided by the diamines N,N′-diethylethylenediamine or meso-stilbenediamine, and the two O ligands by chelating nitrate or nitrite ion. The spectra are assigned in the point group C2v(III). The energies are calculated within the Normalised Spherical Harmonic Hamiltonian and the Orbital Angular Overlap formalisms. The parameters so derived are consistent with previous experience obtained with trans-analogs once the small bite of the chelating nitrite ligand is accounted for.

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